Dunno if I'm alone here, Lufty, but I think for a sports coat, the fit is just right. I'm of the mind that a SC should be just a tad shorter than a suit jacket, otherwise it makes legs appear stubby.
NYR: Here's my $.02 - I agree with the previous posters who said the top is just too dressy for the jeans. Some jeans are can be dressed up, but those jeans are rugged & badass & hefty & old school. Pair it with an buttton-down oxford or plaid shirt, knit tie, boots (like yesterday's) and either a tweed SC or a slim leather jacket, and you'd be set. Brass knuckles optional.